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http://blog.csdn.net/qy1387/article/details/7752973
Java实现树的遍历(前序、中序、后续(递归|非递归)、层次)
http://blog.csdn.net/benweizhu/article/details/7930697
http://blog.csdn.net/gaowenhui2008/article/details/46638037
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原文地址:http://www.cnblogs.com/qiuz/p/4951895.html